Observations of a Brass Compass
I was manufactured in London, in the spring of 1863, by a firm called Bentley & Sons, Instrument Makers to Her Majesty's Navy. My case is brass, polished to a high gleam and then allowed to tarnish deliberately, because a compass that shines too brightly in the desert sun blinds the navigator. My needle is steel, magnetized by a process that I do not understand and do not need to understand. My...
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